Nonlinear negative feedback LED (light emitting diode) switch voltage stabilizing power supply based on phase-sensitive wave detection circuit

Abstract

The invention discloses a nonlinearity negative-feedback and large-current constant stabilized switching power supply of an LED. The nonlinearity negative-feedback and large-current constant stabilized switching power supply is characterized by being mainly composed of a diode rectifier U, a power amplifier P1, a transformer T, a voltage comparator U1, a switch filter circuit, a power output circuit, a transformation feedback circuit, a nonlinearity negative-feedback circuit, a current detection amplifier circuit and the like, the switch filter circuit is connected between the positive electrode output end of the diode rectifier U and the in-phase end of the power amplifier P1 in series, the power output circuit is connected with an auxiliary side coil L2 of the transformer T, the transformation feedback circuit is connected with an auxiliary side coil L3 of the transformer T, the nonlinearity negative-feedback circuit is connected with the transformation feedback circuit, and the input end of the current detection amplification circuit is connected with the negative electrode output end of the diode rectifier U. The current detection amplifier circuit is used for achieving current detection, the bearing current of the switching power supply can be effectively improved, and the application range is wider.

Description

technical field [0001] The invention relates to a switch stabilized voltage power supply, in particular to a nonlinear negative feedback LED switch stabilized voltage power supply based on a phase sensitive detection circuit. Background technique [0002] With the continuous advancement of science and technology, electronic products have brought great convenience to people's life while their functions are becoming more and more powerful. The voltage stabilizing circuit is easy to operate. The traditional series linear regulating voltage stabilizing circuit has the characteristics of high stability, adjustable output voltage, small ripple coefficient, and simple circuit. However, the adjustment tubes of these series linear adjustment type voltage regulator circuits always work in the amplified state, and current flows all the time, so the power consumption of the tubes is relatively large, and the efficiency of the circuit is not high, generally only reaching 30% to 50%. %ab...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the stability coefficient of the current switch-type regulated power supply is not high, and to provide a non-linear negative feedback LED switching regulated power supply based on a phase-sensitive detection circuit

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